svn commit: r367228 - in stable: 11/contrib/llvm-project/lldb/source/Target 12/contrib/llvm-project/lldb/source/Target
Dimitry Andric
dim at FreeBSD.org
Sat Oct 31 18:42:04 UTC 2020
Author: dim
Date: Sat Oct 31 18:42:03 2020
New Revision: 367228
URL: https://svnweb.freebsd.org/changeset/base/367228
Log:
MFC r364480:
Merge commit 1ce07cd614be from llvm git (by me):
Instantiate Error in Target::GetEntryPointAddress() only when
necessary
When Target::GetEntryPointAddress() calls
exe_module->GetObjectFile()->GetEntryPointAddress(), and the returned
entry_addr is valid, it can immediately be returned.
However, just before that, an llvm::Error value has been setup, but
in this case it is not consumed before returning, like is done
further below in the function.
In https://bugs.freebsd.org/248745 we got a bug report for this,
where a very simple test case aborts and dumps core:
* thread #1, name = 'testcase', stop reason = breakpoint 1.1
frame #0: 0x00000000002018d4 testcase`main(argc=1, argv=0x00007fffffffea18) at testcase.c:3:5
1 int main(int argc, char *argv[])
2 {
-> 3 return 0;
4 }
(lldb) p argc
Program aborted due to an unhandled Error:
Error value was Success. (Note: Success values must still be checked prior to being destroyed).
Thread 1 received signal SIGABRT, Aborted.
thr_kill () at thr_kill.S:3
3 thr_kill.S: No such file or directory.
(gdb) bt
#0 thr_kill () at thr_kill.S:3
#1 0x00000008049a0004 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52
#2 0x0000000804916229 in abort () at /usr/src/lib/libc/stdlib/abort.c:67
#3 0x000000000451b5f5 in fatalUncheckedError () at /usr/src/contrib/llvm-project/llvm/lib/Support/Error.cpp:112
#4 0x00000000019cf008 in GetEntryPointAddress () at /usr/src/contrib/llvm-project/llvm/include/llvm/Support/Error.h:267
#5 0x0000000001bccbd8 in ConstructorSetup () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:67
#6 0x0000000001bcd2c0 in ThreadPlanCallFunction () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:114
#7 0x00000000020076d4 in InferiorCallMmap () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/Utility/InferiorCallPOSIX.cpp:97
#8 0x0000000001f4be33 in DoAllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.cpp:604
#9 0x0000000001fe51b9 in AllocatePage () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:347
#10 0x0000000001fe5385 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:383
#11 0x0000000001974da2 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2301
#12 CanJIT () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2331
#13 0x0000000001a1bf3d in Evaluate () at /usr/src/contrib/llvm-project/lldb/source/Expression/UserExpression.cpp:190
#14 0x00000000019ce7a2 in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Target/Target.cpp:2372
#15 0x0000000001ad784c in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:414
#16 0x0000000001ad86ae in DoExecute () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:646
#17 0x0000000001a5e3ed in Execute () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandObject.cpp:1003
#18 0x0000000001a6c4a3 in HandleCommand () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:1762
#19 0x0000000001a6f98c in IOHandlerInputComplete () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2760
#20 0x0000000001a90b08 in Run () at /usr/src/contrib/llvm-project/lldb/source/Core/IOHandler.cpp:548
#21 0x00000000019a6c6a in ExecuteIOHandlers () at /usr/src/contrib/llvm-project/lldb/source/Core/Debugger.cpp:903
#22 0x0000000001a70337 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2946
#23 0x0000000001d9d812 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/API/SBDebugger.cpp:1169
#24 0x0000000001918be8 in MainLoop () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:675
#25 0x000000000191a114 in main () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:890
Fix the incorrect error catch by only instantiating an Error object
if it is necessary.
Reviewed By: JDevlieghere
Differential Revision: https://reviews.llvm.org/D86355
This should fix lldb aborting as described in the scenario above.
Reported by: dmgk
PR: 248745
Modified:
stable/11/contrib/llvm-project/lldb/source/Target/Target.cpp
Directory Properties:
stable/11/ (props changed)
stable/11/contrib/llvm-project/lldb/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/12/contrib/llvm-project/lldb/source/Target/Target.cpp
Directory Properties:
stable/12/ (props changed)
Modified: stable/11/contrib/llvm-project/lldb/source/Target/Target.cpp
==============================================================================
--- stable/11/contrib/llvm-project/lldb/source/Target/Target.cpp Sat Oct 31 17:26:56 2020 (r367227)
+++ stable/11/contrib/llvm-project/lldb/source/Target/Target.cpp Sat Oct 31 18:42:03 2020 (r367228)
@@ -2412,21 +2412,13 @@ lldb::addr_t Target::GetPersistentSymbol(ConstString n
llvm::Expected<lldb_private::Address> Target::GetEntryPointAddress() {
Module *exe_module = GetExecutableModulePointer();
- llvm::Error error = llvm::Error::success();
- assert(!error); // Check the success value when assertions are enabled.
- if (!exe_module || !exe_module->GetObjectFile()) {
- error = llvm::make_error<llvm::StringError>("No primary executable found",
- llvm::inconvertibleErrorCode());
- } else {
+ // Try to find the entry point address in the primary executable.
+ const bool has_primary_executable = exe_module && exe_module->GetObjectFile();
+ if (has_primary_executable) {
Address entry_addr = exe_module->GetObjectFile()->GetEntryPointAddress();
if (entry_addr.IsValid())
return entry_addr;
-
- error = llvm::make_error<llvm::StringError>(
- "Could not find entry point address for executable module \"" +
- exe_module->GetFileSpec().GetFilename().GetStringRef() + "\"",
- llvm::inconvertibleErrorCode());
}
const ModuleList &modules = GetImages();
@@ -2437,14 +2429,21 @@ llvm::Expected<lldb_private::Address> Target::GetEntry
continue;
Address entry_addr = module_sp->GetObjectFile()->GetEntryPointAddress();
- if (entry_addr.IsValid()) {
- // Discard the error.
- llvm::consumeError(std::move(error));
+ if (entry_addr.IsValid())
return entry_addr;
- }
}
- return std::move(error);
+ // We haven't found the entry point address. Return an appropriate error.
+ if (!has_primary_executable)
+ return llvm::make_error<llvm::StringError>(
+ "No primary executable found and could not find entry point address in "
+ "any executable module",
+ llvm::inconvertibleErrorCode());
+
+ return llvm::make_error<llvm::StringError>(
+ "Could not find entry point address for primary executable module \"" +
+ exe_module->GetFileSpec().GetFilename().GetStringRef() + "\"",
+ llvm::inconvertibleErrorCode());
}
lldb::addr_t Target::GetCallableLoadAddress(lldb::addr_t load_addr,
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